Remove unused jnt functions
Remove unused jnt functions

The 4x2 transforms gives a compile warning with gcc 6.3.0 but appears
to be unused:

*((void *)&temp2+8)' is used uninitialized in this function

Change-Id: I8b08e05d0365dc117b5374ec00bddc6f7bd84bd3

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom